Flexible DC converter valve bridge arm current anomaly detection method and device

The invention discloses a flexible DC converter valve bridge arm current abnormity detection method and device, relates to the technical field of flexible DC power transmission, and mainly aims to timely and accurately find converter valve bridge arm current abnormity, rapidly give an alarm and start switching of a control system when the converter valve bridge arm current abnormity is abnormal, thereby avoiding DC control function abnormity of a DC system, and improving the reliability of the converter valve bridge arm current abnormity. And safe and stable operation of the flexible DC converter station is ensured. According to the main technical scheme, the method comprises the steps that the current value of each bridge arm in the flexible direct-current converter valve is acquired; judging whether the flexible direct current converter valve meets a bridge arm abnormal condition or not according to the change condition of the current value in the preset period, wherein the bridge arm abnormal condition is